US5124012A - Process for the desalination of sea and for obtaining energy and the raw materials contained in sea water - Google Patents

Process for the desalination of sea and for obtaining energy and the raw materials contained in sea water Download PDF

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US5124012A
US5124012A US07/532,259 US53225990A US5124012A US 5124012 A US5124012 A US 5124012A US 53225990 A US53225990 A US 53225990A US 5124012 A US5124012 A US 5124012A
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process defined
seawater
flow
water
electrodes
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Grigori Berleyev
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Dombaj GmbH
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Dombaj GmbH
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    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B7/00—Halogens; Halogen acids
    • C01B7/01—Chlorine; Hydrogen chloride
    • C01B7/03—Preparation from chlorides
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
    • B01J19/00—Chemical, physical or physico-chemical processes in general; Their relevant apparatus
    • B01J19/08—Processes employing the direct application of electric or wave energy, or particle radiation; Apparatus therefor
    • B01J19/087—Processes employing the direct application of electric or wave energy, or particle radiation; Apparatus therefor employing electric or magnetic energy
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B3/00—Hydrogen; Gaseous mixtures containing hydrogen; Separation of hydrogen from mixtures containing it; Purification of hydrogen
    • C01B3/02—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen
    • C01B3/06—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen by reaction of inorganic compounds containing electro-positively bound hydrogen, e.g. water, acids, bases, ammonia, with inorganic reducing agents
    • C01B3/08—Production of hydrogen or of gaseous mixtures containing a substantial proportion of hydrogen by reaction of inorganic compounds containing electro-positively bound hydrogen, e.g. water, acids, bases, ammonia, with inorganic reducing agents with metals
    • C—CHEMISTRY; METALLURGY
    • C01—INORGANIC CHEMISTRY
    • C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
    • C01D1/00—Oxides or hydroxides of sodium, potassium or alkali metals in general
    • C01D1/04—Hydroxides
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/469—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis
    • C02F1/4691—Capacitive deionisation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/001—Processes for the treatment of water whereby the filtration technique is of importance
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/08—Seawater, e.g. for desalination
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30—Hydrogen technology
    • Y02E60/36—Hydrogen production from non-carbon containing sources, e.g. by water electrolysis
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/30—Wastewater or sewage treatment systems using renewable energies
    • Y02W10/37—Wastewater or sewage treatment systems using renewable energies using solar energy

Definitions

  • the invention relates to a process and a device for the desalination of sea water and for obtaining energy and the raw materials contained in sea water.
  • the evaporation and distillation of water requires an energy input of approximately 25 to 30 kWh/m 3 water and hence involves a high energy input, with the heat supplied being at least largely lost in the process.
  • Distillation plants also have the disadvantage that they are exposed to a high risk of corrosion, making it necessary to replace the surfaces coming into contact with the sea water after 11/2 to 2 years.
  • the productivity of these distillaiton plants is restricted to a maximum of 1000 m 3 per day.
  • the freezing process is based on the formation and growth of individual crystals on which only chemically homogeneous substances agglomerate, whereas foreign particles find no place in the lattice.
  • the formation of inter-crystalline zones in which foreign particles can settle takes place in aqueous solutions when approximately 50% of the salt solution has changed into the solid state.
  • the refrigeration units required for freezing in this way also operate at a low efficiency, and yet are very complex in terms of process technology. In any event, in practice the options described are relatively costly.
  • Niether has the so-called reverse osmosis process been technically successful, since the water quantities produced in the largest experimental plants barely exceeds 1000 liters per day.
  • reverse osmosis the salt solution is pressed through cellulose acetate membranes at pressures of 50 bar, or sometimes up to 100 bar.
  • the mechanical stress on the membranes is correspondingly high.
  • a disadvantage of this desalination method is that the membranes become unusable after a long period of use for various reasons, e.g. bacterial attack.
  • Reverse osmosis admittedly has the advantage over the previously described methods that only small quantities of energy are used, by this cannot outweigh the disadvantages of low productivity and the danger of damage to the membranes.
  • This object is achieved according to the invention in a process for the desalination of sea water and for obtaining energy and the raw materials contained in sea water, in which the sea water is passed through an electrostatic field lying transverse to its direction of flow, and in addition to an ion-low sea water current, sea water currents enriched in anions and cations respectively are drawn off.
  • the sea water in a first stage is drawn from below into a chamber which is fitted with essentially vertically planar electrodes coated with a dielectric in such a way that the ions are deflected towards the electrodes by the electrostatic field between the electrodes, but are entrained by the current flow directed into the drawing-off lines and supported by gravitation before they reach the electrodes.
  • the de-ionized part of the water is drawn off above the electrodes.
  • the aqueous ion flows drawn off are conveyed past conductors, discharged there are conveyed into a separation stage. On the one hand this objective is attained through the process.
  • the charge is approximately 10 8 coulomb, which corresponds to an energy content through coulomb force of 2.6 ⁇ 10 -21 joules.
  • the kinetic energy of the ions, ion contrast, at 5.8 ⁇ 10 -21 is almost three times greater, so that by utilizing the high degree of movement of the ions, ion separation without neutralization can be achieved.
  • the process according to the invention allows, as well as sea water desalination and the obtaining of energy, the extraction of the raw materials bound in the sea water, essentially alkali metals and alkaline earth metals, hydrogen and chloride gas.
  • the oppositely poled ions are separated in an electrostatic field, using their kinetic energy, which exceeds the coulomb attraction, but are drawn off out of the electrostatic field by the pronounced suction effect of the water as it flows off, without being neutralised.
  • the water currents, each containing only ions of one polarity are then conveyed past conductors, where they are discharged.
  • the charge withdrawn can be drawn off directly as direct current, direct current having the advantage that the loss of voltage, even with conveyance via extremely long lines, is markedly less than in the case of alternating current.
  • the voltages applied are 200 kV to 500 kV in the case of direct current voltage, or in the case of square wave voltage between 5 and 20 kV, preferably between 7 kV and 10 kV, at a frequency of between 10 Hz and 2 kHz.
  • a laboratory experiment used frequencies of between 10 and 30 Hz, but to obtain a high level of current 1 kHz to 2 kHz is suggested.
  • Such repulsion pulses can also be envisaged where a square wave voltage is used; in this case the short-duration voltage pulses used are of 20 microsec maximum or up to a maximum of 1/20 of the square wave voltage pulse duration i.e. the duration of the positive voltage pulse.
  • the ions are separated by means of electrode
  • only partial separation of the ions present in the sea water is possible, representing at least approximately 20% of the sea water quantities used.
  • the ion separation level depends essentially on what voltages are applied and upon the flow speeds with which the sea water is conveyed through the electrodes. If appropriate the sea water can also be recycled several times through the same separation stage.
  • the water/ion flows concerned are conveyed in grounded lines.
  • the already de-ionized water quantities in the first stage can be drawn off separately from these flows, and represent around 20% of the water quantities used.
  • the ion flows are conveyed on a non-grounded line partition parallel to each other at a distance from each other such that the coulomb attraction becomes effective, with the result that the oppositely poled ions re-concentrate at the facing edge zones of the lines; the more distant flow layers are deionised at the same time, so that by means of appropriate bifurcation the deionized water on the one hand and the smaller quantities of water with a high ion concentration on the other are conveyed separately.
  • the conveyance in lines in this second stage is selected in such a way that 95 to 97% deionised water can be drawn off, so that after the second stage only approximately 2.4 to 4% of the original water quantity with a high ion concentration is conveyed to the conductors.
  • an electrostatic field which is as large as possible is developed in the first stage; this can be done by the application of a voltage of between 200 to 500 kV to the electrodes.
  • the preferred flow speed of the separated ion flows is between 3 and 7 m/sec.
  • the flow of sea water or of the aqueous ion solution can be maintained by having the sea water pumped into a storage vessel, e.g. 8 to 10 m high, before the first stage, maintaining the flow or water or ions solely through the use of the previously produced potential energy. In other words, following the pumping up of the water, only gravitational force it used to maintain the flow.
  • the sea water in the first stage is conveyed from below into a chamber with essentially vertical planar electrodes, with the ions being drawn off by the electrostatic field between the electrodes towards the appropriate electrode in each case.
  • the ions Before the ions reach the electrodes they are, however, drawn off by the current flow directed into the drawing-off lines, by which means the separation of ions described above into two flows each containing ions of a given polarity (positive or negative) is achieved.
  • the already deionized water is preferably drawn off above the electrodes.
  • the electrodes of the first stage are coated with a dielectric.
  • the objective is to select a flow speed which is as high as possible in accordance with the electrostatic field
  • in the second stage it is preferable, in order to prevent long line conveyance at this point, to slow down the flow speed of the ions by increasing the cross-section of the line, say to 40 to 60% of the previous speed.
  • This enables the coulomb force between the ions of opposite polarity, which are conveyed in separate lines, to act particularly effectively, with the repellant force between the charges of like polarity being overcome by the total coulomb force of the sum of all charge carriers.
  • sea water is mechanically filtered prior to being introduced into the first stage.
  • the lyes remaining in solution have different specific weights, which allows their separation into various fractions.
  • Caustic soda and caustic potassium solution (NaOH and KOH) are immediately usable in industry.
  • Magnesium hydroxide and calcium hydroxide can be further processed independently of each other for the separation of magnesium and calcium respectively. This is performed by heating the lyes in question to metal oxides (MgO or CaO) and then passing hydrogen over the oxides according to the equations.
  • MgO or CaO metal oxides
  • the separation of magnesium and calcium can preferably be carried out by making use of the different melting points.
  • the melting point of magnesium is 651° C.
  • that of calcium is 881° C.
  • the magnesium contained in the mixture melts and can be drawn off in liquid form, and similarly the calcium is melted by heating to 900° C. and also drawn off in liquid form.
  • a further usable element is the chlorine which is contained in large guantities in sea water.
  • the chlorine can be conveyed following neutralization in the conductor stage into a reaction vessel, initially in dissolved form; in the reaction vessel it is gradually reacted, forming water and chlorine gas.
  • the volatile chlorine gas can be collected and conveyed if appropriate for cleansing of evaporated water to a cooler.
  • the purified chlorine gas is preferably cooled in a condenser to -50° C. and compressed.
  • the process according to the invention is hence usable in an industrial-scale plant, such as on motor-propelled ships, which can use both the electrical energy and the hydrogen produced as energy reservoir and energy supplier.
  • an industrial-scale plant such as on motor-propelled ships
  • the use of hydrogen, with an energy level almost three times as high as that of hydrocarbons, has the advantage that it burns without producing toxic materials.
  • the apparatus for carrying out the process of the invention comprises:
  • a storage tank with at least one pump arranged in a feed line ending under the water level and a first flow-off line fitted with an adjustable or controllable valve emerging into a second vessel,
  • a second vessel with an essentially vertically arranged pair of electrodes for the formation of an electrostatic field which is connected in the bottom of the container or in the area of the bottom of the container with the first flow-off line or lines, and which below the electrodes has two flow-off channels and above the electrodes has a further flow-off line (21),
  • the two flow-off channels are grounded.
  • the grounding of the flow-off channels is interrupted on a partition and the flow-off channels in this area run parallel at a distance of between 2.5 and 3 m, and a further discharge line branches off from each flow-off channel in this area.
  • the flow-off channels can be at a minimum distance of 3 m from each other in front of and behind the partition.
  • the flow-off channels can have a diameter of 8 to 12 cm in front of the partition, a widened diameter, preferably to 1.3 to 2 times the cross-section, in the partition, and behind the branching drawing-off lines a cross-section only 3 to 5% of this size.
  • the storage tank, the second storage tank, the electrodes, the flow-off channels and/or the flow-off pipes can be lined with plastic, preferably PVC.
  • the electrodes opposite each other can be formed as the walls of the second vessel and the vessel can have an essentially prismatic structure with the base facing downwards.
  • the electrodes in the lower area can be bent outwards.
  • a first flow-off line of at least 8 cm in diameter.
  • the storage tank can have several filters and/or slurry deposit basins.
  • the separation device can consist of several reaction vessels, precipitation vessels and collection vessels.
  • Essential parts of this device are the first stage, already described above, in which ions of different polarity are separated from each other; this field is formed by a planar pair of electrodes to which voltages of between 200 and 500 kV are applied, with the electrodes preferably also forming two of the four walls of a prism-shaped vessel.
  • sea water is carried out through a flow-off line from a storage tank which is preferably 8 to 10 m high, with the already de-ionized water (approximately 20%) being able to be drawn off above the electrodes and the water flows with differently-poled ions below the electrodes, into flow-off channels or lines.
  • These flow-off channels lead to conductors in which discharge occurs, before hydrogen, alkaline lyes, alkaline earth metals and chlorine gas are obtained.
  • the two flow-off channels are preferably grounded as noted; according to a further feature of the invention the grounding of the flow-off channels is interrupted on a partition and the flow-off channels in this area rum parallel at a distance of between 2.5 and 3 m from each other.
  • a further drawn-off line for de-ionized water also branches off; the flow-off channels for the further conveyance of the still more concentrated ions in aqueous solution have a considerably smaller radius.
  • the flow-off channels before the partition have a diameter of 8 to 12 cm, they have a wider diameter in the partition, preferably increased to 1.3 to 2 times the cross-section, and after the branched-off flow-off line they have a cross-section of only 3 to 5% of this size.
  • the distance between the flow-off channels before and after the said partition, in which further ion concentration takes place (second separation stage), is at least 3 m.
  • the storage tank has several filters and/or slurry deposit basins, so that the water pumped into the storage containers passes through several spirally arranged chambers or filters before being further conveyed into the second vessel (electrostatic field).
  • the separation device for obtaining the chemical substances contained in sea water consists of several reaction vessels, precipitation vessels and collection vessels, all known in the art.
  • FIG. 1 is a diagrammatic representation of the plant according to the invention.
  • FIG. 2 is a view in perspective of this plant for the desalination of sea water and obtaining of energy on an industrial scale.
  • the sea water 10 is fed by means of one or more pumps 11 via a feed line 13 ending below the sea level 12 into a storage tank 14 (FIG. 1).
  • a filter 15 is provided on the end of the feed line.
  • the storage tank 14 is approximately 8 to 10 m high and has sufficient capacity to provide water supply to the downstream parts of the plant even in the event of the failure of a pump 11 or if the filter 15 has to be cleaned for a short time.
  • the pump 11 is also the only part of the plant which requires energy; after the water has been pumped up, the current flow is maintained by gravitational force alone from that point.
  • From the storage tank 14 at least one flow-off line 16, with a regulation valve 18, leads to a second vessel 17.
  • the flow-off line 16 emerges into this vessel 17 in its essentially rectangular or square bottom area.
  • the vessel 17 is also constructed in essentially prismatic form, with two of the four walls being formed as electrodes 19, 20, which are connected to appropriate control and supply systems. In the area of the top of the prism there is a flow-off line 21 for the removal of deionized water. Below the electrodes, whose lower ends are bent outwards, there are two flow-off channels 22, 23, with diameter of 10 cm. These flow-off channels 22, 23 are grounded and lead to a further second ion separation stage 24, in which the grounding of the flow-off channels is removed and the flow-off channels are brought closer together, from being a distance of 3 m apart to 0.5 m. In this second ion separation stage the flow-off channel diameter is increased in order to create a lesser flow speed.
  • the flow speed is determined in such a way that the path length available s 2 is sufficient for the ions to accumulate through their coulomb attraction in the facing edge zones in each case of the flow-off channels and to be conveyed via flow-off channels 25, 26 of smaller diameter to conductors 27, 28.
  • lines 29, 30 for the ion-free water also branch off.
  • the charges given off to the conductors 27, 28 are conveyed via lines 31, 32 in a manner known according to the prior art.
  • the part of the flow-off channels 25, 26 behind the conductors 27, 28 emerges directly into a separation device 33, 34, in which not only hydrogen, but also alkaline and alkaline earth lyes, calcium, magnesium and chlorine are obtained.
  • the device according to the invention operates as follows:
  • the aqueous salt solution is conveyed into the storage tank 14 and from there into the second vessel 17, where it comes into the electrostatic field formed by the electrodes 19, 20.
  • the electrodes 19, 20 are insulated by plastic coatings, so that there is no electrical contact with the aqueous solution.
  • the voltage to the electrodes should be as high as possible, e.g. 500 kV. Once the electrical field has been set up, the energy loss can be regarded as relatively small, since the current flow from the electrodes should be 5 mA at the most.
  • the height of the electrodes 19, 20 is determined in terms of the quantity of water conveyed into the vessel 17 and its flow speed, in such a way that the water flowing out via the flow-off line 21 is deionized.
  • the electric field applied prevents the ions from flowing out via the flow-off line 21, but rather the ions are conveyed downwards in the direction of the arrows 35, 36 in connection with the water flow in that area, and are conveyed away via the flow-off channels 22, 23, probably with a flow speed of between 5 and 7 m/sec.
  • the ions are hence merely deflected, but not neutralised. In the course of this deflection process they lose a portion of their kinetic energy, which at the same time constitutes a hindrance from their further movement towards the flow-off line 21. Rather they are entrained by the suction of the water flowing away in the flow-off channels 22, 23. If the suction of the water along the electrodes 19, 20 is not sufficient, if appropriate a broad-meshed lattice 37, 38 can be arranged before each electrode, which would create a flow channel above the flow-off channels 25, 26. This lattice would naturally be made of plastic.
  • the flow-off channels 25, 26 are grounded up to the second separation stage 24.
  • the earthing ends a short distance before the second separation stage, where the lines also run parallel close to each other, so that the coulomb attraction becomes effective.
  • This attraction leads to the ions accumulating in the edge zones of the facing areas, so that the deionized water can be drawn off via flow-off channels 25, 26, whereas a portion of the aqueous solution with all the ions (2 to 5%) is further conveyed via the continued flow-off channels 25, 26.
  • These flow-off channels are also grounded. The current discharge takes place to the conductors which form the wall areas of the flow-off channels 25, 26.
  • this hydrogen is stored in hydrogen containers after having been drawn off and cleansed of water by condensation.
  • the hydrogen can be used in the plant, for example as fuel.
  • the remaining alkaline and alkaline earth lyes can be separated on the basis of their differing specific weights, and the alkaline lyes are immediately usable commercially. To obtain pure metals, the alkaline earth lyes are first heated, which produces water and the metal oxides concerned.
  • the metal oxides are conveyed on into a further reaction chamber, where they are exposed to the action of a reducing hydrogen flame, with the reaction being maintained by constant withdrawal of water.
  • the separation of the individual alkaline earth metals, particularly magnesium and calcium, takes place in a further stage by step-wise heating, first to a temperature above the melting point of magnesium (651° C.) but below the melting point of calcium (881° C.), so that the magnesium becomes liquid and can be drawn off. After heating to e.g. 900° C. the calcium becomes liquid and can be drawn off. The remaining residue is removed elsewhere.
  • Metal rectification 40 is shown in FIG. 2.
  • FIG. 2 also shows further stands 42 and power supply means 43 for the electrodes 19, 20 and control units 44 for the current obtained.

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  • Engineering & Computer Science (AREA)
  • Inorganic Chemistry (AREA)
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  • Water Treatment By Electricity Or Magnetism (AREA)
US07/532,259 1989-04-19 1990-06-01 Process for the desalination of sea and for obtaining energy and the raw materials contained in sea water Expired - Fee Related US5124012A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE3912793A DE3912793A1 (de) 1989-04-19 1989-04-19 Verfahren und vorrichtung zur meerwasserentsalzung und zur gewinnung von energie und der im meerwasser enthaltenen rohstoffe
CN90103074A CN1056669A (zh) 1989-04-19 1990-05-24 海水脱盐以及获得能量和海水中含有的原料的方法和装置
OA59934A OA10037A (en) 1989-04-19 1990-12-28 Procedure and device for distilling sea-water and for extracting electrical energy and raw materials of the sea-water

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US5124012A true US5124012A (en) 1992-06-23

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US (1) US5124012A (fi)
EP (1) EP0468981A1 (fi)
JP (1) JPH04504674A (fi)
CN (1) CN1056669A (fi)
AU (1) AU5407490A (fi)
CA (1) CA2053263A1 (fi)
DD (1) DD293800A5 (fi)
DE (1) DE3912793A1 (fi)
FI (1) FI914891A0 (fi)
IL (1) IL94116A0 (fi)
NZ (1) NZ233383A (fi)
OA (1) OA10037A (fi)
PT (1) PT93805A (fi)
WO (1) WO1990012758A1 (fi)
YU (1) YU78090A (fi)

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US5454916A (en) * 1992-10-29 1995-10-03 Iwata; Yosihiro Method of obtaining fresh water from seawater and device used therein
US5647965A (en) * 1994-03-25 1997-07-15 Crose; James R. Apparatus and method for separating a charged substance from a conductive fluid
US6267854B1 (en) 1999-10-21 2001-07-31 Orville Lee Maddan Apparatus and method for producing magnesium from seawater
US6372017B1 (en) 2000-02-07 2002-04-16 Orville Lee Maddan Method for producing magnesium
WO2002079097A1 (en) * 2001-03-30 2002-10-10 Cerezo Holdings Pty Ltd Method and apparatus for separating ions from a fluid
US20040055955A1 (en) * 2002-08-02 2004-03-25 University Of South Carolina Production of purified water and high value chemicals from salt water
US20060060532A1 (en) * 2004-09-13 2006-03-23 The University Of South Carolina Water desalination process and apparatus
WO2008009723A1 (fr) * 2006-07-20 2008-01-24 Fip Ag Unite de dessalement d'eau de mer ou d'eau saumatre
US20100051450A1 (en) * 2007-05-11 2010-03-04 Masataka Murahara Onsite integrated production factory
US20110011801A1 (en) * 2008-03-13 2011-01-20 Drexel University Desalination system and process
CN103253744A (zh) * 2012-02-20 2013-08-21 刘志刚 一种淡化海水并提取盐的方法
US20140102902A1 (en) * 2011-05-25 2014-04-17 Coway Co., Ltd. Apparatus and method for controlling total dissolved solids, and water treatment apparatus including the same
WO2017058949A1 (en) * 2015-09-28 2017-04-06 Massachusetts Institute Of Technology Systems and methods for collecting a species
US9815715B2 (en) 2014-05-01 2017-11-14 Ladi Water, Llc System and method for desalination

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GR960100341A (el) * 1996-10-07 1998-06-30 . Ιοντα ομοσημα, ουδετερα σωματα, διαλυτης, ενεργεια και μεθοδος για την παραγωγη τους.
EP2043957A4 (en) * 2006-07-17 2011-12-07 Vecenergy Aegir Llc MICROSCALE CAPACITIVE DEIONIZATION DEVICE
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OA10037A (en) 1996-10-14
CA2053263A1 (en) 1990-10-20
AU5407490A (en) 1990-11-16
PT93805A (pt) 1990-11-20
YU78090A (en) 1991-08-31
EP0468981A1 (de) 1992-02-05
IL94116A0 (en) 1991-01-31
DE3912793A1 (de) 1990-10-25
NZ233383A (en) 1992-03-26
DD293800A5 (de) 1991-09-12
FI914891A0 (fi) 1991-10-16

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